Locally heavy rains produced some flash flooding in Columbia and Richmond Counties.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CAE wrote it up.
Locally heavy rains produced some flash flooding in Columbia and Richmond Counties.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Columbia, SC wrote its last area forecast discussion before the first event at Aug 11, 8:49 AM EST, 1 hour 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE COLUMBIA SC 949 AM EDT SAT AUG 11 2012 .SYNOPSIS... A SLOW MOVING COLD FRONT WILL APPROACH THE FORECAST AREA FROM THE NORTHWEST THROUGH TODAY. THE FRONT WILL BECOME DIFFUSE AS IT MOVES INTO THE AREA. WEAK HIGH PRESSURE WILL BUILD IN FROM THE WEST ON SUNDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... SHORT WAVE MOVING EAST INTO AREA NOW. A LARGE AREA OF SHOWERS IN THE WEST MOVING EAST. DECIDED TO UP POPS TO 80 PERCENT MOST LOCATIONS FOR ABOUT 3 HOURS TODAY. THEN 60 PERCENT FOR REST OF THE AFTERNOON. HIGHS IN THE MIDDLE 80S STILL OK. OTHERWISE...AMPLIFIED UPPER LEVEL LOW CENTERED WILL DRIVE A COLD FRONT TOWARD SOUTH CAROLINA LATER THIS AFTERNOON. THE FRONT APPEARS TO STALL IN THE MOUNTAINS BUT CONVERGENCE ASSOCIATED WITH PRE-FRONTAL TROUGH/MODERATE INSTABILITY AND DEEP MOISTURE ALONG WITH SHORT WAVE TRIGGERS SHOULD RESULT IN NUMEROUS SHOWERS AND THUNDERSTORMS BY 18Z. PRECIPITABLE WATER AROUND 2.00 INCHES SUGGEST CONTINUED THREAT OF HEAVY RAIN. ISOLATED SEVERE THUNDERSTORMS POSSIBLE WITH MARGINALLY STRONG DEEP LAYER SHEAR...ESPECIALLY NORTHERN MIDLANDS. TEMPERATURES SHOULD BE SIMILAR TO YESTERDAY. SREF SUPPORTS HIGHER POPS SO ADJUSTED THEM UP MAINLY DURING THE AFTERNOON AND EARLY EVENING. && .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/... FRONTAL BOUNDARY APPEARS TO MOVE THROUGH CENTRAL SOUTH CAROLINA EARLY SUNDAY...NOTICEABLE DRIER AIR MASS EXPECTED WITH DEW POINTS FALLING INTO THE LOWER 60S...POSSIBLY 50S BY MONDAY. WITH MOISTURE FLUX SHIFTING EAST OF THE AREA AFTER 00Z EXPECT DECREASING CHANCE SHOWERS...AND CLEARING SKIES. AIR MASS DRYING OUT THROUGH MONDAY WITH SHALLOW MOISTURE...AND FORECAST SOUNDINGS APPEAR CAPPED AS SHORT WAVE RIDGE MOVES OVER THE AREA. DRY AND WARMER CONDITIONS EXPECTED WITH TEMPERATURES NEAR NORMAL. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... THE GFS SHOWS RIDGING TO THE SOUTH WITH LEE-SIDE TROUGHING IN THE FORECAST AREA DURING MUCH OF THE EXTENDED PERIOD. THE PATTERN SUPPORTS MAINLY WIDELY SCATTERED/SCATTERED THUNDERSTORMS EACH DAY. ANOTHER FRONT APPROACHES FROM THE NORTHWEST BY FRIDAY WHICH MAY BRING ANOTHER CHANCE FOR MAINLY AFTERNOON AND EVENING THUNDERSTORMS FRIDAY. EXPECT TEMPERATURES NEAR CLIMATOLOGY WITH LOWS IN THE LOWER 70S AND HIGHS IN THE LOWER 90S. && .AVIATION /14Z SATURDAY THROUGH WEDNESDAY/... SHORT WAVE WILL MOVE EAST THROUGH THE REGION TODAY. IT WILL BE ACCOMPANIED BY A COLD FRONT WHICH SHOULD MOVE INTO THE AREA EITHER LATE THIS AFTERNOON OR THIS EVENING. MAINLY VFR CONDITIONS TODAY AND TONIGHT BUT BRIEF IFR-MVFR CONDITIONS ARE POSSIBLE IN SHOWERS AND THUNDERSTORMS. CONDITIONS ARE EXPECTED TO DRY OUT LATE TONIGHT THROUGH SUNDAY. VFR CONDITIONS CONTINUE TONIGHT AND SUNDAY. AFTERNOON HEATING PLUS CONVERGENCE AHEAD OF THE SLOW MOVING FRONT PLUS LIFT UNDER THE RIGHT ENTRANCE REGION OF THE H25 JET WILL LIKELY RESULT IN SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS. DID NOT INCLUDE THUNDERSTORMS IN THE TERMINAL FORECASTS BECAUSE OF TIMING UNCERTAINTY. EXTENDED AVIATION OUTLOOK...EXPECT RESTRICTIONS ASSOCIATED WITH EARLY MORNING FOG PLUS MAINLY AFTERNOON AND EVENING THUNDERSTORMS. && .CAE WATCHES/WARNINGS/ADVISORIES... SC...NONE. GA...NONE. && 07/22
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE COLUMBIA SC 421 AM EDT SAT AUG 11 2012 GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-120830- LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD- MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON- RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON- BAMBERG- 421 AM EDT SAT AUG 11 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL GEORGIA AND CENTRAL SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. NUMEROUS SHOWERS AND THUNDERSTORMS WILL OCCUR TODAY AND THIS EVENING. DAMAGING WIND COULD POSSIBLY OCCUR WITH A FEW OF THE THUNDERSTORMS. HEAVY RAIN WITH SOME OF THE THUNDERSTORMS MAY LEAD TO FLOODING IN POOR-DRAINAGE AREAS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY.
The Columbia radar (KCAE), 120 km away, was scanning. The volume nearest the first event began at 14:58 UTC.
5 flash flood. Local standard time, as filed.
LAW ENFORCEMENT reported a flash flood on Harlem-Grovetown Road and off streets near Louisville Road.
Law Enforcement reported flash flooding in the area of John Deere Parkway and Horizon South.
Law Enforcement reported flash flooding in the area of Laney Walker Blvd.
Law Enforcement reported flash flooding in the area of East Hall Streen in Augusta.
Law Enforcement reported flash flooding along Magnolia Ave. in Augusta.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2012Every state in 2012This day in weather historyWarnings in Georgia, August 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 390718, 390719, 390720, 390721, 390722.